Ferromagnetism in doped excitonic insulators

被引：82

作者：

Balents, L ^{[1
]}

Varma, CM ^{[1
]}

机构：

[1] Bell Labs, Lucent Technol, Murray Hill, NJ 07974 USA

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.84.1264

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The theory of doped excitonic insulators is reinvestigated in light of recent experiments on hexaborides. For the appropriate valley-degenerate X-3,X-3' band structure, "intravalley" condensation is energetically favored. Ferromagnetism occurs upon doping due to the quenching of kinetic energy at the otherwise direct first-order excitonic insulator-metal transition. The phase diagram includes states of spatially inhomogeneous density and magnetization at low temperatures.

引用

页码：1264 / 1267

页数：4

共 11 条

[1]

BALENTS L, IN PRESS

[2] SUPERCONDUCTIVITY IN STRONG SPIN-EXCHANGE FIELD [J].

FULDE, P ;

FERRELL, RA .

PHYSICAL REVIEW, 1964, 135 (3A) :A550-+

[3]

HALPERIN BI, 1968, SOLID STATE PHYSICS, V21

[4] ELECTRONIC-STRUCTURE OF CAB6 [J].

HASEGAWA, A ;

YANASE, A .

JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1979, 12 (24) :5431-5440

[5]

Larkin A. I, 1965, Sov. Phys. JETP, V47, P762

[6]

Massidda S, 1997, Z PHYS B CON MAT, V102, P83, DOI 10.1007/s002570050267

[7] RENORMALIZATION-GROUP APPROACH TO INTERACTING FERMIONS [J].

SHANKAR, R .

REVIEWS OF MODERN PHYSICS, 1994, 66 (01) :129-192

[8]

Volkov B. A., 1976, SOV PHYS JETP, V43, P589

[9]

Volkov BA, 1975, SOV PHYS JETP, V41, P952

[10] High-temperature weak ferromagnetism in a low-density free-electron gas [J].

Young, DP ;

Hall, D ;

Torelli, ME ;

Fisk, Z ;

Sarrao, JL ;

Thompson, JD ;

Ott, HR ;

Oseroff, SB ;

Goodrich, RG ;

Zysler, R .

NATURE, 1999, 397 (6718) :412-414

← 1 2 →